Visvesvaraya Technological University (VTU) 2007 B.E Computer Science on mobile communications - Question Paper

asymmetrical communication and various data rates?
4.26 Compare the current situation of mobile phone networks in Europe, Japan, China,
and North America. elaborate the main differences, elaborate efforts to obtain a common
system or at lowest interoperable systems?
4.27 What disadvantage does OVSF have with respect to flexible data rates? How does
UMTS offer various data rates (distinguish ranging from FDD and TDD mode)?
4.28 How are various DPDCHs from various UEs within 1 cell distinguished in UTRA
FDD?
4.29 Which components can perform combining/splitting at what handover situation? What
is the role of the interface Iur? Why can CDMA systems offer soft handover?
4.30 How does UTRA-FDD counteract the near-far effect? Why is this no issue in
GSM?
5. Satellite systems
5.1 Name basic applications for satellite communication and define the patterns.
5.2 Why are GEO systems for telecommunications currently being changed by fibre
optics?
5.3 How do inclination and elevation determine the use of a satellite?
5.4 What characteristics do the various orbits have? elaborate their pros and cons?
5.5 elaborate the general issues of satellite signals travelling from a satellite to a
receiver?
5.6 Considered as an interworking unit in a communication network, what function can a
satellite have?
5.7 What special issues do customers of a satellite system with mobile phones face if
they are using it in big cities? Think of in-building use and skyscrapers.
5.8 Why is there hardly any space in space for GEOs?
6. Broadcast systems
6.1 2G and 3G systems can both transfer data. Compare these approaches with
DAB/DVB and list reasons for and against the use of DAB/DVB.
6.2 Which web pages would be improper for distribution via DAB or DVB?
6.3 How could location based services and broadcast systems work together?
7. Wireless LAN
7.1 How is mobility restricted using WLANs? What additional elements are needed for
roaming ranging from networks, how and where can WLANs support roaming? In your
answer, think of the capabilities of layer two where WLANs reside.
7.2 elaborate the basic differences ranging from wireless WANs and WLANs, and elaborate
the common features? Consider mode of operation, administration, frequencies,
capabilities of nodes, services, national/international regulations.
7.3 With a focus on security, elaborate the issues of WLANs? What level of security
can WLANs provide, what is needed additionally and how far do the standards go?

Earning:   Approval pending.